From 9c083dc05030840a59c6b2491f60e25728b77e46 Mon Sep 17 00:00:00 2001
From: belliash <belliash@codingworkshop.eu.org>
Date: Thu, 23 Feb 2023 00:44:21 +0100
Subject: [PATCH] Map zero page, like e820 does

---
 xtldr/amd64/memory.c | 3 +++
 xtldr/i686/memory.c  | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/xtldr/amd64/memory.c b/xtldr/amd64/memory.c
index b77a0c9..64acabf 100644
--- a/xtldr/amd64/memory.c
+++ b/xtldr/amd64/memory.c
@@ -99,6 +99,9 @@ BlEnablePaging(IN PLIST_ENTRY MemoryMappings,
         ListEntry = ListEntry->Flink;
     }
 
+    /* Map zero page as well */
+    BlMapVirtualMemory(MemoryMappings, 0, 0, 1, PtePointer);
+
     /* Allocate and zero-fill buffer for EFI memory map */
     BlEfiMemoryAllocatePool(sizeof(EFI_MEMORY_MAP), (PVOID*)&MemoryMap);
     RtlZeroMemory(MemoryMap, sizeof(EFI_MEMORY_MAP));
diff --git a/xtldr/i686/memory.c b/xtldr/i686/memory.c
index dd67dc5..2ba4c3b 100644
--- a/xtldr/i686/memory.c
+++ b/xtldr/i686/memory.c
@@ -197,6 +197,9 @@ BlEnablePaging(IN PLIST_ENTRY MemoryMappings,
         ListEntry = ListEntry->Flink;
     }
 
+    /* Map zero page as well */
+    BlMapVirtualMemory(MemoryMappings, 0, 0, 1, PtePointer);
+
     /* Zero-fill buffer for EFI memory map */
     RtlZeroMemory(MemoryMap, sizeof(EFI_MEMORY_MAP));